Mr Goose sir,
I'm not aware of any requirements for the mumber of ADFs or which aid they're tuned to. My approach would depend upon the # of ADFs.
If 2 ADFs, one tuned to each locator. After station passage overthe first locator, I'd track to the second, as the needle wouldn't be as sensitive given the distance to the 2nd locator.
If only 1 ADF, after station passage over 1st locator, tune & ident second locator, and again track to it.
As far as the locators are concerned, I agree with mustafa, that if both locators aren't serviceable, then it really can't be a twin locator approach, can it?
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bottums up !